1. Depending on your cell phone you can down load the xfinity mobile program and load it to your phone.
2. Depending on your cell phone if you have a web browser you can type http://m.comcast.net/m or m.comcast.net/i and select the email on the menu screen and type your username and password. You will also need a data plan.
You might also be able to send a message to a phone as a text message if you know which provider the cel phone user is using. For example, use the ten-digit phone number and if the user has Verizon, you can send the email to firstname.lastname@example.org and use email@example.com for AT&T numbers.
Look at these sites for the correct email address to use: